When their seven-year-old caught the disease on an overseas trip, this decision became a whole community's problem. The outbreak infected 11 children and endangered many others. Also: Comedian Mike Birbiglia singlehandedly ruins a big charity event, and the disquieting truth about Amtrak's Quiet Car.

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A bad apple, at least at work, can spoil the whole barrel. And there's research to prove it. Host Ira Glass talks to Will Felps, a professor at Rotterdam School of Management in the Netherlands, who designed an experiment to see what happens when a bad worker joins a team. Felps divided people into small groups and gave them a task. One member of the group would be an actor, acting either like a jerk, a slacker or a depressive. And within 45 minutes, the rest of the group started behaving like the bad apple. (12 minutes)

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Measles cases are higher in the U.S. than they've been in a decade, mostly because more and more nervous parents are refusing to vaccinate their kids. Contributing Editor Susan Burton tells the story of what happened recently in San Diego, when an unvaccinated 7-year-old boy returned home from a trip to Switzerland, bringing with him the measles. By the end of the ordeal, 11 other children caught the disease, and more than 60 kids had to be quarantined. (22 minutes)

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There's this haven on the U.S. railroad—the Amtrak Quiet Car. You can't yammer on your cell phone in the Quiet Car, or yuck it up with your friends, or even talk above a murmur. For This American Life Producer Nancy Updike, who commutes between New York and Washington, D.C., it's bliss. But then Nancy began to notice that the more she rode the Quiet Car, the more she was becoming like an enforcer in a fascist fraternity. (18 minutes)

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In this act, writer Michael Kinsley describes harnessing the power of his own mind to deal with his Parkinson's diagnosis. Michael Kinsley is a contributing columnist for Vanity Fair and the Washington Post.